Call selector



Dec. 18, 1928.

L. L. cHAuvEAu CALL SELECTOR Filed, Jan. 8, 1923 wventoz Lou f5 CHAUVEAU Patented Dec. 18,1928.

vl'iOl'J'IS L. GHA'U'VEAU, OF PARIS, FRANCE.

CALL SELECTOR.

Application led January 8, 192.3, `Serial No. 611,538, and in- France January 19, 1922.

This apparaten@ for as object to indicate at the station receiving a call over wires or by means of Wireless telegraphy, which' station is sending the call.

For this purpose a system .is provided in which each one of a plurality of stations calls another station by sending a characteristic letter or a group of letters, called the call indication. This indication may for instance, be formed by Morse signals, that is groups of long and short signals.

The call indication displaying device comprises as many lamps or visual signals as there are stations in the system and these Vlamps or visual signals are controlled in Such a manner that when a call indication is sent,

the lampv or visual signal corresponding to this indication is actuated. At the same time an audible signal is also actuated.

-The calling station sends out the indication and the called station is provided With a call indicator displaying device indicating which station is sendingva call in the same manner as is the case in usual telephone practice in which the calling lamp 'of a station is lighted. Y 'For the purpose of exemplifying the invention and explaining the system, bodiment of the apparatus forming thel object of the invention will be disclosed. The accompanying drawing shows the circuit arrangement o the call indicator displaying device.

For the sake of sim licity the description and the drawing disclose an apparatus' by means of which Morse signals composedof three or less signals may be received. It will be obvious to those skilled in the art that the apparatus is applicable toMorse signals composed of more thany three signals without departing from the spirit of the invention.v

The call indicatordisplaying device which must respond to Morse signals comprisestwo groups of elements. The operation of these elements Will first be described in general and the circuits Will be traced in detail later. The first group is -provided for determining i the nature of a signal received; Whether it is a dot or a dash.

The second group controls theorder in which the successive signals forming the call indication are received. Depending) on such order this group of elements esta lishes a suitable circuit for thepurpose .of actuating `the correspondingv lamp'or visual signal.

The group of velements provided for the .purpose of' determining the nature ofthe sig- 26 of dot magnet 20 (1) and to tact 3 the locking relay 4. -When this relay y 1s energlzed it opens at 5 the circuit of the slow release magnet 6. After the expiration of a certain period of time the magnet 6 re-l storesl its contacts-7 and 8. Through the contact 8` of the magnet Gand the contact 9 of the locking magnet 4, the magnet 4 is maintained energized until the magnet 6 fully restores its contacts. As soon as the vcontact 7 is restored the plus pole of the battery is connected With contact 10 of the magnet 2.

The second group comprises dot magnets and dash magnets 21, the number of each being equal to that of the signals composing the call indication to be received.

All the dot magnets are connected tothe dot line 11 and all the 4dash magnets are connected vto the dash line 12. A magnet 22 is connectedl in series Withthe common return path of the dot magnet and the dash magnet .of the same signal. The signal magnet 22 will therefore operate simultaneously ,with the ydot magnet or the dash magnet of the same signal. f

In general, the purpose and operation of the series of signals E, I andV S are to show speciic indications for a given sequence of dots, dashes and spaces. This is accomplished signal is sent andthen if a suicient non-slgl 'nalling' period occurs, relay 137will be dei energized and the signal E or the signal T will be operated dependingupon Whether the impulse is a dot or a dash.. The circuit for E may be traced fromm-lat armature 14, relay 29, armature, 28` (1), signal E, armature The cirat armature 14, relay siGnal T, armature 26 .finalen cuit :for 'I' is from -l- 29,'armature 28 (1), of dash `magnet 21 (l) If two signals were sent out and then a suiiicient non-signalling period occurs, relay 13 will be de-energized and a circuit will be closed forone of the signals, I, N, A, M, 'depending upon whether or -respectively, are transmitted. The circuit for I is from at 14, relay 29 armature' 28 (2), signal I, amature 26 of relay 20 (2) armature 26 of relay 20 (1) and to T iis will occur when the signals consist of a two dots since relays are dot relays. The circuit for signal A, actuated by is from -lat 14, relay 29, armature 28 (2), signal A, armature 26 of relay 21 (2),\armature 26 of relay 20 (1) and to This circuit will be closed after the signals consist, of first a d'ot and then a dash.y Similar circuits may be` traced for N and M, M energizing on two dashes and N on a dash and then a dot. The signals E and T will not be operated when two signals are sent in succession, for the reason that at the end of the first signal relay 13 will not have suliicient time to release and therefore the circuits for these signals will be open at l14 and at the long lpause afterl the second signal the circuits while closed at 14 will b e open at 28, (1) f When three signals are sent in succession one of the eight lower signals will be operated. The circuit for W, for instance, will be from 14, relay 29, signal W, second armature from right of relay 21 (3), armature 26 of'relay 21 (2) armature 26 `of relay.20 (1) and to This corresponds to a succession of signals comprising a dot and two dashes as will be obvious.

The circuit for the 8 signals and the codes corresponding thereto, as obvious from the previous description, will be Cl- I C.- O O -nfor S, D,.R, r, W and O, respectively in'order stated. The signals E and T will not operate when three signals are sent in succession for the reason stated before in connection with the sending of two signals. The signals I, N, A, M, will not be energized at the end of the second signal for the reason that relay 13 will not have sufficient `time to close armature 14 before the third signal arrives. At the long pause after the third Signal, the circuits for these signals will be completed at 14 but these circuits will then'be open at armature 28 (2).

Since the relay 29 operates in connection with any one of the signals, the bell 31 will operate and theI selector will be permanently disconnected from relay 1 until key 32 which includes themaster ground connection is operated to break all the locking circuits. If more than three signals 'are sent in succession relay 33 will operate to open all the locking circuits and the selector will be rev stored to normall without operating any one of the signals. l -When the apparatus is in its normal posltion the series magnet 22 (l) of the'first signal is. the only one that is connected to the pole. Due to this, the first signal can.

ond signal will be energized and will connect the pole tothe magnet 22 (2) of the second slgnal. This second signal will therefore be registered by the dot magnet 20 (2) of the second signal. `At the beginning of the third signal, the magnet 23 (3) is energize'd and connects the pole to the magnets corresponding to the third' signal. p

The dot magnets 20, (1), (2), (3), the dash magnets 21, (1), (2), (3)., and the signal mavnets 23 2), (3) are each provided with a locking contact 25. 4 After 4the receiving of the signal these magnets will be locked y up and only the magnets corresponding to the signals received are energized.

The dot magnets 20(1), (2), (3), and the dash magnets 21, (1), (2), (3), are provided with a certain number of contacts 26 which control the circuit of the lamps or visual indicators: E, T, I, N, A, M, S, D, R, G, U, K, W, O. These contacts are so arranged that they will close only the circuit of the lamp or visual signal corresponding to the signal received. The closing of this circuit occurs only when the last signal received is followed by a silent period or space which is suiiciently long to permit the slow acting" magnet 13 to release its armature." The lamp will then be lighted or the visual signal will be actuated.

The dot magnet 20 (1) and 20 (2) of a signal opens in 27 the circuit of the dash magnet representing the same signal and vice versa. This arrangement is for the purpose of guarding a ain'st faulty operation.

Magnet 22 2) of the second signal opens in 28 (1) the circuit of the lamp or visual signal corresponding to the letters E. T. composed of a single signal. The magnet 22 (3) at the third signal opens in 28 (2)' the circuit of the lamps or visual signals corriesponding to the letters I. N. A. M. composed of two signals.

The lamps or visual indicators are connected in series with magnet 29 which through its contact 30 closes the circuit of the bell 31 and opens the circuit of the magnet 2. The

bell rings and the signals received have no further effect on the apparatus which is` the signallin line controlled by the series magnet 22 (3 of the last signal opens in its contact 34 the current feeding path of the Finally, asignal magnet 33 connected with apparatus, designated by -Gr, if the numberof signals received is higher than the one for which the apparatus is adjusted.

The operation of dot, dash selecting relays Will be better understood b assuming the reception of a certain signal, or example: the letter D comprising a dashfollowed by two dots. Upon the reception of the irst impulse comprising a dash, relay 2 is energized which in turn energizes relay 4 to close its Contact 9 and to move its contactinember 5 to the left de-energizing slow-acting relay 6, which starts its movable contact 7 and 8 moving slowly toward the right. The impulse received bein a dash a circuit is now completed from the pus of movable contact 7 to stationary contact 10 of relay 2, the said relay being still energized owing, to the fact that a dash impulse has been received. The dash line 12 is consequently energized, which in turn energizes the first dash magnet 21 (1) through thel intel-locked contacts 27 and the I, minus terminal of relay 22 (1). The. dash relay 21 (l) consequently closes and locks itself in independent of the dash line by means of its upper contacts 25 and +G, the

, relay 22 (1) also beinglocked in through the same contacts.

The system is noW ready for the reception of the second impulse which is a dot. The contacts of the relay. mechanism- 1 close, resulting in the energization of relay 2, which in tu-rn energizes relay 4 to (ie-energize relay 6. When movable contact 7 of slow-acting relay 6 engages its right hand stationary contact a circuit is completed as follows: from plus terminal to movable Contact 7 to 'stationary contact 15 of relay 2, as the dot impulse received was not of sufficient duration to keep the movable contact of relay 2 in its left-hand position until relay 6 releases. Bot-h the dot line 11 and the signal line 16 are, therefore, energized, the signal line 16 being energized prior to the dot line. The energization of the signal line results in the energization of relay 23 (2) through the contacts of relay.. 22 (1). The energization .of relay 23 (2) results in the preparation of thecircuit for relay 22 ,(2)I The dot line now -being energized results in the energization of the second dot magnet 2() (2) through t-he interlocking contacts of the second dash magnet 21.

(2), thewrelay 22 (2) and the vright-hand contacts of energized relay 23 (2). Attention is called to the fac-tpthat relay 23 (2) when it closes lbcks itself'in through its contacts 25. l'.lhe'second dot relay 20 (2) and' the relay 22 (2) are both locked in by means of the locking contacts 25 of the relay 20 (2).

The system is now ready for the reception of the third signal impulse, which is also a dot.

The signal'line 16 is energized in a similar manner as explained above, which results in the energization of'relay23 (3) through the left-hand contact-s of relay 22 (2). Relay 23 (3) is then locked in independent of the signal liney bymeans of its locking contacts 25. The third signal being a dot, the dot line 11 is energized in a manner as already explained above, which results in the energization of the third dot. relay 20 (3) through the coil of the relay 22 (3) and the right-hand contacts of relay 22 (3). dot relay 2O (3) and relay 22 (3) are then locked in independent of the dot line by means of relay 20 (3)s contacts 25.

The energizaion of relay 22 (3). prepares the circuit for lrela-y 33, which may or may not be energized. If no other signal responds to the signal impulses received is completed as follows: from the plus termis nal through contacts 14, which are closed owing to the fact that relay 13 is deenergized, through relay 29 through indieating device D, through second contacts from the left of relay 20 (3), through second contacts from the left of rela-y 20 (2) and through the first left-hand contacts of relay 21 (1) to the minus terminal. Attention is` also called to the fact that the ener-I gization of relay 29 also completes a circuit through the audible signalling means-31.

Now if the third impulse should be followed by another impulse, the signal line will energize relay 33, which will in turn open contacts 34, to disconnect all the variousrelay coils from the -Gr terminal with the result that the same will give no indication whatsoever. This -G terminal is connected to all of the '+G terminals thereby preventing a -lground connection from these +G terminals, except through -Gn It should be understood that the invention is not .limited tems in which the signals to be received are compo/sed of more than three signals. Without departing from the spirit of the invention the apparatus may be applied forthe selection of signals of a code composed of more than two dili'erent durations (dot and dash) or in which the signals are differentiated by some other characteristic than their duration, (intensity, frequency, etc.). 'The construction of the quick or slow acting relays is immaterial as long as these devices perform their above described functions.

The slow acting magnet 6' is adjusted in such a mfanner that the backcontact of 7 isl closed only after a Yperiod of time which is longer in duration than a'idot but shorter than adash. Under these conditions if the sending relay is in its normal position and the dot line 11 is traversed by current. On

the other hand if the signal received is a I dash the contact 10 is in its actuated position 'and the dash line `12 is traversed by current.

Through its front contact 5, the locking magnet 4 controls the slow acting magnet 13 and the latter determines the duration of the silenty period separating the signals. If these silent periods'are sufficiently long the magnet 13 releases its contact 14 whereupon the lamp will be lighted or the visual indicator displayed.

In addition to the above described apparatus which has been used in `the call selector forming the object .of the above mentioned application, the armature 7 of the slow acting magnet is provided with a front contact and the magnet 2 is provided with an signal received.

(2) The signalling line 16 is traversed by current at. thebeginning of each signal.

The group of elements provided for the 'purpose of controlling the order of arrival of the successive signals forming theindicator is analogous to the one that performs the same function in the apparatus disclosed in applicants U. S. Patent No. 1,597,763 for printing telgraphy,y dated Aug. 31 1926.

Having described my invention I declare v that what I claim is :l

1. In a call selector adapted to select a call made up of from one to 'n impulses, each imlpulse being either relatively long or short, a

plurality of groups of selecting means, means whereby the first group is arranged to respond only to the first received impulse,

y means whereby the second group is arranged to respond only to the second received im-v pulse, and means whereby the nth group is arranged torespond only to the nth impulse received, and meansfor restoring the system to initial condition von the receipt, of the n+1 impulse withinl a lpredetermined time after the termination' of the nth impulse.

y 2. In a call selector,-a plurality of groups of selectors, a plurality of groups of indica-4 tors, one group ofindicat'ors corresponding to each group of selectors, means for causing the first group of selectors to respond only to the first signal impulse to select an indicator of the first group only, means to cause the second group of selectors to respond only to the second signal impulse to select an indicator of the second group, only, means to cause theath group of selectors to respond only to the nth signal impulse to select an indicator of the lnth group only and means for causing the restoration of the system to normal upon the reception of the n+1 `signal within a redetermined time after the termination o the nth signal. y

3. In a call selector, a plurality of groups of selectors a plurality of groups of indica- L cator of the first group only, means to cause the second group of selectors to respond only to the second signal impulse to select an indicator of the second group only means to cause the nth group of selectors to respond only to the nth signal impulseto select an indicator of the nth groupr only, means for causing the restoration of the system to normal upon the reception of the n+1 signal within a predetermined time after the termination of the nth signal and means for causing energization of the indicator selected at the expiration of a predetermined period of silence after they termination of any'signal impulse.

.4. A call selector consisting of means arranged to respond to received signal impulses, three conductors, one of said conductors arranged to be energized whenever a signal impulse is received on said means, another for dots and another for dashes, timing means associated with said signal responsive means for causing energization of another of said conductors when'the received signal impulse is of less than predetermined length, and for causing energization of the third conductor when said impulse is of greater than predetermined length, a plurality of relays arranged to be connected to said ot conductor, a like number of relays arranged to be connected to said"dash conduc-` tor, the number of each group of relays being equal to the number of impulses in-the call having the maximum number of impulses, 'each relay connected to one conductor having means to open the circuit of the corresponding relay connected to the other conductor, holding means associated with said relays,

and the/corresponding. relays4 connected -to* said dot and said dash conductor having a common return circuit, a relay connected in said circuit,`a circuit controlled by said relay, and including a relay arranged to cause the connection of the next corresponding group of relays to the dot and dash conductors respectively, contacts controlled by said relays for preparing theJ circuit of one particular indicating device for a given sequence and number of dofts and dashes, a second timing means for causing energization of said indicating device at the expiration of. a pre'detera mined time period of silence after the termi-y nation of a signal impulse, and means for restoring the system to initial condition upon receipt within said v,predetermined time period of a signali impulse after the operation of the relay'arranged to be operated by the last signal impulse of the signal having the maximum number of impulses.

5. Ina call selector, a plurality of groups of indicators, a plurality of groups of selectors, a plurality of circuits controlled by said selectors for selectively energizing any one of said indicators, means for causing the first group ofselectors to respond only to the first signal' impulse to prepare a circuit for energizing an indicator of the irst group only, means for causing the second group of selectors to respond only to the second signal impulse to prepare a' circuit for energizing an indicator of the second group only and to open the circuit previously selectors of the first group and means for causing the nth group of selectors to respond only to the nth signal impulse to prepare a circuit for energizing an indicator of the nthY group vonly for opening the circuit previously prepared by the selectors of the second group, and to initial condition on receipt of the n-- 1 impulse Within a. predetermined timeafter thev `termination of the -nth impulse.

6. In a call selector' for visibly indicating a call letter transmitted from a sending station,the combination with a relay responsive energizing the signal line,

to the impulses making up the call letter, of a dot line, a dash line and a signal lineassociated with said relay', a sloW release relay controlled by said relay for energizingv either the dot line or the dash line depending upon the nature of the received impulse and for energizing the signall line regardless of the nature of the impulse, a series of relays connected to the dot line, another series of relays connectedto the dash line,'and a series of relays connected to the' signal line-forl preparing the circuits of the dotl or dash relays pre-j paratory to the energization ot the dot or dash line depending upon the nature of each received impulse ot the call letter.

7. In a call selector for visibly a call letter transmitted from a sending. station, the combination With'a relay responsive to the impulses making up the call letter, of a dot line, a dash line and a signal line associated with saidtrelay, a slow release relay controlledby said relay for energizing either the dot line or the dash linedepending upon the nature of the received impulse and for except for the prepared by the received signals,

means for restoring tlie system.

' a predetermined'silent period after the reindicating Aof any impulse,

first impulse, regardless of the nature of the impulse, a first set of relays responsive only to the first impulse, a second set of relays responsive only to the second impulse, and an nth set of relays responsive only to the nth impulse, each set comprising a -lrelay con'- nected'to the dot line and a relay connected to the dash line, a relay connected to the signal line associated With-'each set, from the second to the nth set inclusive, for preparing their circuits prior to the energizing of the dot or dash line, and an nth-P1 relay associated with .the signal line energized by an nth-t1 impulsey for resetting all the relays to normal.

8. In a lcall selector, means responsive to two conductors, a slow release relay controlled by said signal responsive means for selectively energizing said conductors according to the length of the received signal impulse, a plurality of indieating means, means associated with said conductors for .selectively preparing the circuits of one of said indicating means in accordance with the received signal, a second slow re-. lease relay for causing energization of one of\ said indicating means at the expiration of a`\ I0 predetermined period of silence after the tert van impulse received before the expiration of ception of the maximum number of impulses vfor which the system is adjusted.

'9. In a call selector adapted to select a call made up of from one to n impulses, each iinpulse being either relatively long or short,1 a plurality of groups of selecting means, means or causing the first group to respond only to the first received impulse, means for causing the second group to respond only to the second received impulse, and means for causing the nth' group to respond only to `the nth received impulse, timing means arranged to complete the circuit prepared by said selectin means at the expiration of a predetermlned period of silence after the termination and means for restoring the system to initial condition on the receipt of the n -l- 1 impulse within a predetermined time after the termination of the nthl impulse.

LOUIS L. CHAUVEAU. 

